D as System Language

[Columbus via Digitalmars-d]

I'm not so much into the D Projects, but am familiar with the
concepts of the language.
I want to use D as the language of a hobby operating system.
There isn't much documentation about doing so, and the question
already got asked: "When D is a system language, why hasn't
anyone made an OS in it yet?".
So I ask it again, maybe a bit differently:

"Is there usefull documentation about using D as OS language?"

I know there's https://github.com/xomboverlord , but this is for
D1, and didn't get updated to D2.
It won't get updated by me (in the near future), because I don't
know enough of D and the inner workings of it, to do such a thing.
For your interest: At first, the OS should run on x86_64.
Don't expect any repositories hosted by me about an OS in D, it's
just a hobbyistic interest of me.